Assigutob to cbompton



R. A. MARSHALL.

THREAD PARTING MECHANISM. APPu'cAnou FILED was, 1918.

1,367,070. Patented Feb. 1, 1921.

UNITED STATES PATENT OFFICE.

ROBERT A. MARSHALL, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON V & KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

THREAD-PARTING MECHANISM.

To all whom it may concern:

Be it known that 1, ROBERT A. MARSHALL, a citizen of the United States. residing at Worcester, inthe county of Worcester and State of Massachusetts, have invented a new and useful Thread-Parting Mechanism, of which the following is a specification.

This invention relates to a thread parting mechanism designed for use on automatic weft replenishing looms.

In such looms a fresh weft carrier or fresh shuttle is automatically inserted when the running weft carrier is fully or substantially exhausted, and it is then necessary to sever the Weft ends extending from the selvage after such transfer.

It is the general object of my invention to provide, an improved and simplified construction of thread parting mechanism by which increased accuracy and efiiciency in operation will be obtained.

With this general object in view, important features of my invention relate to improved devices for parting the thread, to weft-controlled actuating means therefor, and to improved holding devices cooperating with the thread parting mechanism by holding the thread firmly against the reed during the parting operation.

Other features of my invention relate to arrangements and combinations of parts hereinafter described and more particularly pointed out in the appended claims.

A preferred form of my invention is shown in the drawings, in which Figure 1 is a sectional elevation of a lay and breast beam, showing my invention mounted thereon;

Fig. 2 is a top plan view of my invention, taken along the line 2-2 in Fig. 1;

Fig. 3 is a front elevation of the parts by which a portion of my invention is secured to the hand rail, and

Fig. 4 is an enlarged detail view of the thread holding devices.

Referring to the drawings, I have indicated a lay 10 having the usual hand rail 11 and reed 12. The breast beam of the loom is indicated at 13.

Certain parts of my invention, including the thread parting member, are mounted on the hand rail of the lay; and other parts of my invention, including the thread holding device and the actuating mechanism, are mounted on the breast beam. I will first describe the parts mounted on the hand rail.

I Specification of Iictters Patent.

Patented Feb. 1, 1921.

Application filed August 9, 1918. Serial No. 249,056.

A casting 14 is secured to the hand rail by bolts 15 extending through vertical slots in the casting, thus permitting vertical adjustment of the thread parting member. A stand 16 has a bolt and slot connection to the casting 14 and may be adjusted laterally thereon. The parting member comprises a lever 1'7 pivoted on a stud 18 fixed in the stand 16. A thin steel blade 19 extends rearwardly and downwardly from the lever 17, to which it is secured by bolts 20.

The lever 17 is also provided with a forwardly extending portion 21 to which a cam roll 22 is adjustably secured by a bolt 23 (Fig. 2). Anupwardly extending offset projection 24 of the portion 21 is engaged by an adjusting screw 25 (Fig. 3) threaded into a lug 26 mounted on the front side of the stand 16. This screw is to be so adjusted that the blade 19 will normally assume the position shown in full lines in Fig. 1, with its front edge slightly withdrawn from the path of the shuttle. A coil spring 27 (Fig. 2) is connected at one end to the lever 17 and at the other end to a collar 28 adjustable on the stud 18. The spring 27 holds the lever 17 and connected parts yieldingly in normal position with the projection 24 engaging the adjusting screw 25.

.The parts mounted on the breast beam comprise a casting 30 to which is adjustably secured a stand 31 provided with bearings 32 and 33 for a slide 34. The slide 34 is normally held in rearward position by a coil spring 35 engaging the bearing 32 at one end and a collar 36 on the slide 34 at the other end. At its rear or left-hand, as viewed in the drawings, the slide 34 has an offset portion 37 to which leather jaws 38 are secured by a plate 39 and screws 40 (Fig. 4).

A cam plate 41 is pivoted at 42 to the slide 34 and is held in normal engagement with a stop 43 by a sprin 44 connected at one end to the cam plate 41 and at the other end to a downward projection 45 of the stand 31.

The cam plate 41 has a downwardly extending portion 46 adapted to be engaged by an actuator 47 guided in the downwardly extending portion 45 and vertically reciprocated regularly by operating devices not shown. The actuator 47 is movable from the inoperative position shown in full lines in Fig. 1 to the operative position indicated in dotted lines therein by a link 48 connected to an arm 49 mounted on a shaft 50,

which shaft is controlled through connections (not shown) from the weft detecting mechanism of the loom.

Having described the construction of my invention, I will now describe its method of operation. When the weft on the running weft carrier is fully or substantially exhausted, the weft detecting mechanism will indicate a transfer and will operate through the arm 49 and link 48 to move the actuator 47 forward to a position in which it will engage the depending portion 46 of the cam plate 421, The actuator 47 is thereafter raised and the cam plate will be moved to the dotted line position shown in Fig. 1.

its the lay moves forward,the cam roll 22 on the thread parting member will engage the cam plate 41 and will be raised thereby, the parts assuming the dotted line position shown in Fig. 1. At the same time the leather jaws 38 on the slide 3% will have been engaged by the reed and the weft W will have been clamped against the face of the reed as indicated in Fig. 4. The weft is thus held firmly in position during the forward movement of the thread parting member, and the thread is parted by the member between the jaws 38. The slide 3% is adapted to yield slightly after the jaws 3S engage the rcee, and is also adapted to be pushed forward a substantial distance if engaged by a misplaced shuttle.

It will be seen that I have provided a very simple construction having few working parts and that these few parts are so formed as to require the minimum of attention. It will be further evident that changes and modifications can be made in the construction herein shown without departing from the spirit and scope of my invention as set forth in the claims, and I do not wish to be it against the reed, and means to give said member an operative movement while the weft is so held.

2. In a loom having a breast beam, a lay and a reed, in combination, a thread part ing member mounted on the lay with its pivot in front of-the reed and having a forwardly projecting portion, a cam roll adjustably secured to said portion, a slide yieldingly mountedon the breast beam, yielding holding jaws on said slide cooperating with said member, a cam plate pivoted to said slide, an actuator for said plate effective to move said plate to operative position, and

ieans to render said actuator operative when a weft carrier transfer is indicated.

3. In a loom having a breast beam, a lay and a reed, in combination, a thread parting member mounted on the lay, means including a cam for actuating said member, a regularly reciprocated actuator for said cam, and weft-controlled means to move said actuator to operative and inoperative positions relative to said cam.

in testimony whereof I have hereunto aflixed my signature.

ROBERT A. MARSHALL. 

